Volvo RWD 120-130 Forum

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Weber adjustment problems 120-130

I've finally adjusted the timing and the Weber 32 36 like a clock. Pulls real good on every gear, downshifts without stuttering, and just runs great except win driving slow. When driving slow around 30 40 mph the engine wobbles. You have to feather the throttle to keep the same mph and then the car starts bucking but when you floor the throttle car jumps and runs fine. Does anyone know what I can do to the needles or the adjustment on the carb. I think maybe the 32 venturi on the carb with needles is not adjusted right or using the wrong needle. Maybe running to rich or lean. But man the car screams under full throttle.








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Weber adjustment problems 120-130

Try one size smaller idle air corrector on the IDLE jet on the primary throat.

--
Three 164's, Two 144's, One 142 & a partridge in a pear tree.








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Weber adjustment problems 120-130

Don't feel lonely, my weber carb does the same thing. It just doesn't like to run at a feathered throttle. The bucking can be pretty bad at any speed.

I assume it is a lean throttle mix because I get close to 25mpg in suburban driving. I live at 1100 MSL, so it is not high altitude. Nor does it matter what temperature or humidity levels are.

This didn't happen when I picked up the car, the carb was sooo dirty it was a wonder it even ran.

Klaus
--
Why are Volvos so endearing? Its just a car.








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Weber adjustment problems 120-130

I don't know if the 32/36 Webers as supplied in kits all carry the same generic jetting--or if they are more tailored to different motors. I was lucky in that I had access to Weber carbs from different European cars--as well as a few Pinto and Vega Holley/Weber clones. Although the throttles/venturis vary, the jets, etc. all interchange. So I was able to compare lots of aspects. I had the same symptoms with a 32/36 (came to me separately--don't know the history) on a B20. After a few seconds of steady throttle driving on the highway it felt like it needed more--level off and then the same thing would happen--not radical but annoying enough to make itself known. I did some reading in a Weber published book and Haynes Weber manual and then proceeded to compare/swap emulsion tubes---worked for me. -- Dave








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Weber adjustment problems 120-130

If the carb is in otherwise good condition--no blocked passage ways, etc.--I'd look into the air correction jets--and/or the emulsion tubes located just under those jets. The emulsion tubes get fished (bent paper clip will do it) out of the wells they sit in (the a/c jets hold them in place). The emulsion tubes come in a variety of profiles/hole configurations and if not right can cause the mixture to lean out under steady running. -- Dave







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